Answer:
B.They form skeletal muscle fibers.
Explanation:
B.They form skeletal muscle fibers. They are formed of the proteins actin and myosin.
A.They form the structure of some hormones. IT IS CORRECT.
C.They form myelin around nerve fibers. IT IS CORRECT.
D.They provide cushioning around soft organs. IT IS CORRECT.
E.They form the plasma membrane structure. IT IS CORRECT.